so far

CPU
AMD Phenom II X4 940 @ 3.0 Ghz

Mobo
Biostar TA790GXB A2+

PSU
Corsair 650tx

RAM:
4Gb G. Skill 1066 Mhz

GPU:
Nvidia Geforce 9800 GT

im using this pc for gaming what should i add to notice the biggest improvement in game play

i also have a g5 mouse and 22" wide screen monitor

Hate to say but you need a better videocard. Look for a good 4870/4890 for cheap. Or if you can get a GTX 260 that would work.

For a 22" TFT a video card would yield instant results...does not matter if its ATi or nVidia. Only other route is a C2D 8600 and C2D board....that would clock like mad. So you could get 4Ghz and that would be a massive boost over your AMD. And you could sell your AMD stuff.

BTW....I am saying all this as you stated "GAMING RIG"......depends on what you are willing to spend the rig you have now is quite nice to be honest.

I just built this rig i was looking like if i should add more ram new gfx card, sound card etc my budget is flexible maybe getting it in the next month

A 9800GT is an adequate card for anything out right now, I would hold off on a GPU upgrade until DX11 cards become available (should be within the next 2-3 months).

A 9800GT and 22 inch monitor is pretty rough. It was pretty rough for me with a 9800GTX+. I say get a cheap 4870 and sell that old 9800GT. You can get one for $150.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814102825

Yeah ive been looking at the 4870 seems great.. *Puts the 9800 on ebay*

I just got mine over a 9800GTX+ and I am pleased. Make sure to get the 1GB one.

Nah, I say get the GTX295.....

Yeah listen to Plug, get the 295...